QTabBar

The QTabBar class provides a tab bar, e.g. for use in tabbed dialogs. More

Inheritance diagram of PySide2.QtWidgets.QTabBar

Synopsis

Functions

Virtual functions

Slots

Signals

Detailed Description

QTabBar is straightforward to use; it draws the tabs using one of the predefined shapes , and emits a signal when a tab is selected. It can be subclassed to tailor the look and feel. Qt also provides a ready-made QTabWidget .

Each tab has a tabText() , an optional tabIcon() , an optional tabToolTip() , optional tabWhatsThis() and optional tabData() . The tabs’s attributes can be changed with setTabText() , setTabIcon() , setTabToolTip() , setTabWhatsThis and setTabData() . Each tabs can be enabled or disabled individually with setTabEnabled() .

Each tab can display text in a distinct color. The current text color for a tab can be found with the tabTextColor() function. Set the text color for a particular tab with setTabTextColor() .

Tabs are added using addTab() , or inserted at particular positions using insertTab() . The total number of tabs is given by count() . Tabs can be removed from the tab bar with removeTab() . Combining removeTab() and insertTab() allows you to move tabs to different positions.

The shape property defines the tabs’ appearance. The choice of shape is a matter of taste, although tab dialogs (for preferences and similar) invariably use RoundedNorth . Tab controls in windows other than dialogs almost always use either RoundedSouth or TriangularSouth . Many spreadsheets and other tab controls in which all the pages are essentially similar use TriangularSouth , whereas RoundedSouth is used mostly when the pages are different (e.g. a multi-page tool palette). The default in QTabBar is RoundedNorth .

The most important part of QTabBar ‘s API is the currentChanged() signal. This is emitted whenever the current tab changes (even at startup, when the current tab changes from ‘none’). There is also a slot, setCurrentIndex() , which can be used to select a tab programmatically. The function currentIndex() returns the index of the current tab, count holds the number of tabs.

QTabBar creates automatic mnemonic keys in the manner of QAbstractButton ; e.g. if a tab’s label is “&Graphics”, Alt+G becomes a shortcut key for switching to that tab.

The following virtual functions may need to be reimplemented in order to tailor the look and feel or store extra data with each tab:

For subclasses, you might also need the tabRect() functions which returns the visual geometry of a single tab.

fusion-tabbar1

A tab bar shown in the Fusion widget style .

fusion-tabbar-truncated2

A truncated tab bar shown in the Fusion widget style.

See also

QTabWidget

class PySide2.QtWidgets.QTabBar([parent=None])

Creates a new tab bar with the given parent .

PySide2.QtWidgets.QTabBar.Shape

This enum type lists the built-in shapes supported by QTabBar . Treat these as hints as some styles may not render some of the shapes. However, position should be honored.

Constant

Description

QTabBar.RoundedNorth

The normal rounded look above the pages

QTabBar.RoundedSouth

The normal rounded look below the pages

QTabBar.RoundedWest

The normal rounded look on the left side of the pages

QTabBar.RoundedEast

The normal rounded look on the right side the pages

QTabBar.TriangularNorth

Triangular tabs above the pages.

QTabBar.TriangularSouth

Triangular tabs similar to those used in the Excel spreadsheet, for example

QTabBar.TriangularWest

Triangular tabs on the left of the pages.

QTabBar.TriangularEast

Triangular tabs on the right of the pages.

PySide2.QtWidgets.QTabBar.ButtonPosition

This enum type lists the location of the widget on a tab.

Constant

Description

QTabBar.LeftSide

Left side of the tab.

QTabBar.RightSide

Right side of the tab.

PySide2.QtWidgets.QTabBar.SelectionBehavior

This enum type lists the behavior of QTabBar when a tab is removed and the tab being removed is also the current tab.

Constant

Description

QTabBar.SelectLeftTab

Select the tab to the left of the one being removed.

QTabBar.SelectRightTab

Select the tab to the right of the one being removed.

QTabBar.SelectPreviousTab

Select the previously selected tab.

PySide2.QtWidgets.QTabBar.accessibleTabName(index)
Parameters

index – int

Return type

str

Returns the accessibleName of the tab at position index , or an empty string if index is out of range.

PySide2.QtWidgets.QTabBar.addTab(icon, text)
Parameters
Return type

int

This is an overloaded function.

Adds a new tab with icon icon and text text . Returns the new tab’s index.

PySide2.QtWidgets.QTabBar.addTab(text)
Parameters

text – str

Return type

int

Adds a new tab with text text . Returns the new tab’s index.

PySide2.QtWidgets.QTabBar.autoHide()
Return type

bool

This property holds If true, the tab bar is automatically hidden when it contains less than 2 tabs..

By default, this property is false.

See also

visible

PySide2.QtWidgets.QTabBar.changeCurrentOnDrag()
Return type

bool

This property holds If true, then the current tab is automatically changed when dragging over the tabbar..

Note

You should also set acceptDrops property to true to make this feature work.

By default, this property is false.

PySide2.QtWidgets.QTabBar.count()
Return type

int

This property holds the number of tabs in the tab bar.

PySide2.QtWidgets.QTabBar.currentChanged(index)
Parameters

index – int

PySide2.QtWidgets.QTabBar.currentIndex()
Return type

int

This property holds the index of the tab bar’s visible tab.

The current index is -1 if there is no current tab.

PySide2.QtWidgets.QTabBar.documentMode()
Return type

bool

This property holds Whether or not the tab bar is rendered in a mode suitable for the main window..

This property is used as a hint for styles to draw the tabs in a different way then they would normally look in a tab widget. On macOS this will look similar to the tabs in Safari or Sierra’s Terminal.app.

See also

documentMode

PySide2.QtWidgets.QTabBar.drawBase()
Return type

bool

This property defines whether or not tab bar should draw its base..

If true then QTabBar draws a base in relation to the styles overlab. Otherwise only the tabs are drawn.

See also

pixelMetric() PM_TabBarBaseOverlap QStyleOptionTabBarBase

PySide2.QtWidgets.QTabBar.elideMode()
Return type

TextElideMode

This property holds how to elide text in the tab bar.

This property controls how items are elided when there is not enough space to show them for a given tab bar size.

By default the value is style dependent.

See also

elideMode usesScrollButtons SH_TabBar_ElideMode

PySide2.QtWidgets.QTabBar.expanding()
Return type

bool

This property holds When expanding is true QTabBar will expand the tabs to use the empty space..

By default the value is true.

See also

documentMode

PySide2.QtWidgets.QTabBar.iconSize()
Return type

PySide2.QtCore.QSize

This property holds The size for icons in the tab bar.

The default value is style-dependent. iconSize is a maximum size; icons that are smaller are not scaled up.

See also

iconSize

PySide2.QtWidgets.QTabBar.initStyleOption(option, tabIndex)
Parameters

Initialize option with the values from the tab at tabIndex . This method is useful for subclasses when they need a QStyleOptionTab , but don’t want to fill in all the information themselves.

PySide2.QtWidgets.QTabBar.insertTab(index, icon, text)
Parameters
Return type

int

This is an overloaded function.

Inserts a new tab with icon icon and text text at position index . If index is out of range, the new tab is appended. Returns the new tab’s index.

If the QTabBar was empty before this function is called, the inserted tab becomes the current tab.

Inserting a new tab at an index less than or equal to the current index will increment the current index, but keep the current tab.

PySide2.QtWidgets.QTabBar.insertTab(index, text)
Parameters
  • index – int

  • text – str

Return type

int

Inserts a new tab with text text at position index . If index is out of range, the new tab is appened. Returns the new tab’s index.

PySide2.QtWidgets.QTabBar.isMovable()
Return type

bool

This property holds This property holds whether the user can move the tabs within the tabbar area..

By default, this property is false ;

PySide2.QtWidgets.QTabBar.isTabEnabled(index)
Parameters

index – int

Return type

bool

Returns true if the tab at position index is enabled; otherwise returns false .

PySide2.QtWidgets.QTabBar.isTabVisible(index)
Parameters

index – int

Return type

bool

Returns true if the tab at position index is visible; otherwise returns false.

PySide2.QtWidgets.QTabBar.minimumTabSizeHint(index)
Parameters

index – int

Return type

PySide2.QtCore.QSize

Returns the minimum tab size hint for the tab at position index .

PySide2.QtWidgets.QTabBar.moveTab(from, to)
Parameters
  • from – int

  • to – int

Moves the item at index position from to index position to .

PySide2.QtWidgets.QTabBar.removeTab(index)
Parameters

index – int

Removes the tab at position index .

See also

SelectionBehavior

PySide2.QtWidgets.QTabBar.selectionBehaviorOnRemove()
Return type

SelectionBehavior

This property holds What tab should be set as current when removeTab is called if the removed tab is also the current tab..

By default the value is SelectRightTab .

See also

removeTab()

PySide2.QtWidgets.QTabBar.setAccessibleTabName(index, name)
Parameters
  • index – int

  • name – str

Sets the accessibleName of the tab at position index to name .

PySide2.QtWidgets.QTabBar.setAutoHide(hide)
Parameters

hide – bool

This property holds If true, the tab bar is automatically hidden when it contains less than 2 tabs..

By default, this property is false.

See also

visible

PySide2.QtWidgets.QTabBar.setChangeCurrentOnDrag(change)
Parameters

change – bool

This property holds If true, then the current tab is automatically changed when dragging over the tabbar..

Note

You should also set acceptDrops property to true to make this feature work.

By default, this property is false.

PySide2.QtWidgets.QTabBar.setCurrentIndex(index)
Parameters

index – int

This property holds the index of the tab bar’s visible tab.

The current index is -1 if there is no current tab.

PySide2.QtWidgets.QTabBar.setDocumentMode(set)
Parameters

set – bool

This property holds Whether or not the tab bar is rendered in a mode suitable for the main window..

This property is used as a hint for styles to draw the tabs in a different way then they would normally look in a tab widget. On macOS this will look similar to the tabs in Safari or Sierra’s Terminal.app.

See also

documentMode

PySide2.QtWidgets.QTabBar.setDrawBase(drawTheBase)
Parameters

drawTheBase – bool

This property defines whether or not tab bar should draw its base..

If true then QTabBar draws a base in relation to the styles overlab. Otherwise only the tabs are drawn.

See also

pixelMetric() PM_TabBarBaseOverlap QStyleOptionTabBarBase

PySide2.QtWidgets.QTabBar.setElideMode(mode)
Parameters

modeTextElideMode

This property holds how to elide text in the tab bar.

This property controls how items are elided when there is not enough space to show them for a given tab bar size.

By default the value is style dependent.

See also

elideMode usesScrollButtons SH_TabBar_ElideMode

PySide2.QtWidgets.QTabBar.setExpanding(enabled)
Parameters

enabled – bool

This property holds When expanding is true QTabBar will expand the tabs to use the empty space..

By default the value is true.

See also

documentMode

PySide2.QtWidgets.QTabBar.setIconSize(size)
Parameters

sizePySide2.QtCore.QSize

This property holds The size for icons in the tab bar.

The default value is style-dependent. iconSize is a maximum size; icons that are smaller are not scaled up.

See also

iconSize

PySide2.QtWidgets.QTabBar.setMovable(movable)
Parameters

movable – bool

This property holds This property holds whether the user can move the tabs within the tabbar area..

By default, this property is false ;

PySide2.QtWidgets.QTabBar.setSelectionBehaviorOnRemove(behavior)
Parameters

behaviorSelectionBehavior

This property holds What tab should be set as current when removeTab is called if the removed tab is also the current tab..

By default the value is SelectRightTab .

See also

removeTab()

PySide2.QtWidgets.QTabBar.setShape(shape)
Parameters

shapeShape

This property holds the shape of the tabs in the tab bar.

Possible values for this property are described by the Shape enum.

PySide2.QtWidgets.QTabBar.setTabButton(index, position, widget)
Parameters

Sets widget on the tab index . The widget is placed on the left or right hand side depending upon the position .

Any previously set widget in position is hidden.

The tab bar will take ownership of the widget and so all widgets set here will be deleted by the tab bar when it is destroyed unless you separately reparent the widget after setting some other widget (or None ).

PySide2.QtWidgets.QTabBar.setTabData(index, data)
Parameters
  • index – int

  • data – object

Sets the data of the tab at position index to data .

See also

tabData()

PySide2.QtWidgets.QTabBar.setTabEnabled(index, enabled)
Parameters
  • index – int

  • enabled – bool

If enabled is true then the tab at position index is enabled; otherwise the item at position index is disabled.

See also

isTabEnabled()

PySide2.QtWidgets.QTabBar.setTabIcon(index, icon)
Parameters

Sets the icon of the tab at position index to icon .

See also

tabIcon()

PySide2.QtWidgets.QTabBar.setTabText(index, text)
Parameters
  • index – int

  • text – str

Sets the text of the tab at position index to text .

See also

tabText()

PySide2.QtWidgets.QTabBar.setTabTextColor(index, color)
Parameters

Sets the color of the text in the tab with the given index to the specified color .

If an invalid color is specified, the tab will use the QTabBar foreground role instead.

See also

tabTextColor()

PySide2.QtWidgets.QTabBar.setTabToolTip(index, tip)
Parameters
  • index – int

  • tip – str

Sets the tool tip of the tab at position index to tip .

See also

tabToolTip()

PySide2.QtWidgets.QTabBar.setTabVisible(index, visible)
Parameters
  • index – int

  • visible – bool

If visible is true, make the tab at position index visible, otherwise make it hidden.

See also

isTabVisible()

PySide2.QtWidgets.QTabBar.setTabWhatsThis(index, text)
Parameters
  • index – int

  • text – str

Sets the What’s This help text of the tab at position index to text .

See also

tabWhatsThis()

PySide2.QtWidgets.QTabBar.setTabsClosable(closable)
Parameters

closable – bool

This property holds Whether or not a tab bar should place close buttons on each tab.

When is set to true a close button will appear on the tab on either the left or right hand side depending upon the style. When the button is clicked the tab the signal tabCloseRequested will be emitted.

By default the value is false.

PySide2.QtWidgets.QTabBar.setUsesScrollButtons(useButtons)
Parameters

useButtons – bool

This property holds Whether or not a tab bar should use buttons to scroll tabs when it has many tabs..

When there are too many tabs in a tab bar for its size, the tab bar can either choose to expand its size or to add buttons that allow you to scroll through the tabs.

By default the value is style dependant.

See also

elideMode usesScrollButtons SH_TabBar_PreferNoArrows

PySide2.QtWidgets.QTabBar.shape()
Return type

Shape

This property holds the shape of the tabs in the tab bar.

Possible values for this property are described by the Shape enum.

PySide2.QtWidgets.QTabBar.tabAt(pos)
Parameters

posPySide2.QtCore.QPoint

Return type

int

Returns the index of the tab that covers position or -1 if no tab covers position ;

PySide2.QtWidgets.QTabBar.tabBarClicked(index)
Parameters

index – int

PySide2.QtWidgets.QTabBar.tabBarDoubleClicked(index)
Parameters

index – int

PySide2.QtWidgets.QTabBar.tabButton(index, position)
Parameters
Return type

PySide2.QtWidgets.QWidget

Returns the widget set a tab index and position or None if one is not set.

See also

setTabButton()

PySide2.QtWidgets.QTabBar.tabCloseRequested(index)
Parameters

index – int

PySide2.QtWidgets.QTabBar.tabData(index)
Parameters

index – int

Return type

object

Returns the data of the tab at position index , or a null variant if index is out of range.

See also

setTabData()

PySide2.QtWidgets.QTabBar.tabIcon(index)
Parameters

index – int

Return type

PySide2.QtGui.QIcon

Returns the icon of the tab at position index , or a null icon if index is out of range.

See also

setTabIcon()

PySide2.QtWidgets.QTabBar.tabInserted(index)
Parameters

index – int

This virtual handler is called after a new tab was added or inserted at position index .

See also

tabRemoved()

PySide2.QtWidgets.QTabBar.tabLayoutChange()

This virtual handler is called whenever the tab layout changes.

See also

tabRect()

PySide2.QtWidgets.QTabBar.tabMoved(from, to)
Parameters
  • from – int

  • to – int

PySide2.QtWidgets.QTabBar.tabRect(index)
Parameters

index – int

Return type

PySide2.QtCore.QRect

Returns the visual rectangle of the tab at position index , or a null rectangle if index is hidden, or out of range.

PySide2.QtWidgets.QTabBar.tabRemoved(index)
Parameters

index – int

This virtual handler is called after a tab was removed from position index .

See also

tabInserted()

PySide2.QtWidgets.QTabBar.tabSizeHint(index)
Parameters

index – int

Return type

PySide2.QtCore.QSize

Returns the size hint for the tab at position index .

PySide2.QtWidgets.QTabBar.tabText(index)
Parameters

index – int

Return type

str

Returns the text of the tab at position index , or an empty string if index is out of range.

See also

setTabText()

PySide2.QtWidgets.QTabBar.tabTextColor(index)
Parameters

index – int

Return type

PySide2.QtGui.QColor

Returns the text color of the tab with the given index , or a invalid color if index is out of range.

PySide2.QtWidgets.QTabBar.tabToolTip(index)
Parameters

index – int

Return type

str

Returns the tool tip of the tab at position index , or an empty string if index is out of range.

See also

setTabToolTip()

PySide2.QtWidgets.QTabBar.tabWhatsThis(index)
Parameters

index – int

Return type

str

Returns the What’s This help text of the tab at position index , or an empty string if index is out of range.

PySide2.QtWidgets.QTabBar.tabsClosable()
Return type

bool

This property holds Whether or not a tab bar should place close buttons on each tab.

When is set to true a close button will appear on the tab on either the left or right hand side depending upon the style. When the button is clicked the tab the signal tabCloseRequested will be emitted.

By default the value is false.

PySide2.QtWidgets.QTabBar.usesScrollButtons()
Return type

bool

This property holds Whether or not a tab bar should use buttons to scroll tabs when it has many tabs..

When there are too many tabs in a tab bar for its size, the tab bar can either choose to expand its size or to add buttons that allow you to scroll through the tabs.

By default the value is style dependant.

See also

elideMode usesScrollButtons SH_TabBar_PreferNoArrows